Acts 15:22, 30-32, 36-40

Then it pleased the apostles and elders, with the whole church, to send chosen men of their own company to Antioch with Paul and Barnabas, namely, Judas who was also named Barsabas, and Silas, leading men among the brethren.

So when they were sent off, they came to Antioch; and when they had gathered the multitude together, they delivered the letter. When they had read it, they rejoiced over its encouragement. Now Judas and Silas, themselves being prophets also, exhorted and strengthened the brethren with many words.

Then after some days Paul said to Barnabas, “Let us now go back and visit our brethren in every city where we have preached the word of the Lord, and see how they are doing.” Now Barnabas was determined to take with them John called Mark. But Paul insisted that they should not take with them the one who had departed from them in Pamphylia, and had not gone with them to the work. Then the contention became so sharp that they parted from one another. And so Barnabas took Mark and sailed to Cyprus; but Paul chose Silas and departed, being commended by the brethren to the grace of God.